I just put in my new cd/mp3 changer in and when i took the power was taken away from my radio my theftlock system turned on. Since i bought the truck used i do not know the code so i am stuck. i was wondering if there is a universial gm code i am totally done witht the install but the radio is locked up someone help me lol. My truck is a 2001 ext cab with the cd player radio if that matters.